Site not functional after update (see older "500 Error after updating" thread)

Hi Skandha, fyi, I retried recently and noticed that my complete site including admin part still becomes non-functional when trying to upgrade from 3.9.4 to 3.9.7. My site is still on WP 4.6.14. Among other plugins, I am using “Multisite Language Switcher” and “Content Aware Sidebars”. Have a look: http://www.st-ie.com Like lesliekirk, I had to roll back to the previous version (3.9.4 in my case), which restored functionality. Probably I need to setup a sandbox and try an upgrade of the WP core. Kind regards, Ville